diff --git a/.github/workflows/cmake.yml b/.github/workflows/cmake.yml
index b435419..cf90146 100644
--- a/.github/workflows/cmake.yml
+++ b/.github/workflows/cmake.yml
@@ -17,7 +17,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [ubuntu-latest, macos-latest, windows-2019]
     steps:
     - uses: actions/checkout@v2
     - run: |
@@ -28,7 +28,7 @@ jobs:
     - run: brew install capstone nasm mingw-w64 glfw glm
       if: matrix.os == 'macOS-latest'
     - run: choco install python3 nasm
-      if: matrix.os == 'windows-latest'
+      if: matrix.os == 'windows-2019'
     - name: Create Build Environment
       # Some projects don't allow in-source building, so create a separate build directory
       # We'll use this as our working directory for all subsequent commands
@@ -48,7 +48,7 @@ jobs:
       run: cmake $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=$BUILD_TYPE
     
     - name: Configure CMake (Linux\Windows)
-      if: matrix.os == 'ubuntu-latest' || matrix.os == 'windows-latest'
+      if: matrix.os == 'ubuntu-latest' || matrix.os == 'windows-2019'
       # Use a bash shell so we can use the same syntax for environment variable
       # access regardless of the host operating system
       shell: bash
@@ -73,7 +73,7 @@ jobs:
       run: ./src/test/Disassembler_TEST
     
     - name: Test Windows
-      if: matrix.os == 'windows-latest'
+      if: matrix.os == 'windows-2019'
       working-directory: ${{github.workspace}}/build
       shell: bash
       # Execute tests defined by the CMake configuration.  
diff --git a/int-tests/mac/CMakeLists.txt b/int-tests/mac/CMakeLists.txt
index ee4859e..a7c6ef9 100644
--- a/int-tests/mac/CMakeLists.txt
+++ b/int-tests/mac/CMakeLists.txt
@@ -1,6 +1,12 @@
 # Project "mac-tests"
 project(mac-tests ASM_NASM)
 set(CMAKE_ASM_NASM_LINK_FLAGS "-macosx_version_min 10.13 -lSystem")
+if (CMAKE_HOST_SYSTEM_NAME STREQUAL "Darwin" 
+    AND CMAKE_HOST_SYSTEM_VERSION VERSION_GREATER_EQUAL 20
+    AND CMAKE_HOST_SYSTEM_VERSION VERSION_LESS 21)
+    set(CMAKE_ASM_NASM_LINK_FLAGS "${CMAKE_ASM_NASM_LINK_FLAGS} -L /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/lib")
+    message(STATUS "Running on Big Sur")
+endif ()
 # Specify ASM linker
 set(CMAKE_ASM_NASM_LINK_EXECUTABLE "ld <CMAKE_ASM_NASM_LINK_FLAGS> <LINK_FLAGS> <OBJECTS> -o <TARGET> <LINK_LIBRARIES>")
 
diff --git a/src/cli/binaryfilecli.cpp b/src/cli/binaryfilecli.cpp
index be9939d..7376bb9 100644
--- a/src/cli/binaryfilecli.cpp
+++ b/src/cli/binaryfilecli.cpp
@@ -17,6 +17,7 @@ BinaryFileCLI::BinaryFileCLI(int argc, char **argv) : BaseCLI(argc, argv) {
                                   // its only in BaseCLI
   this->filename = parser.get<std::string>("f");
   this->dynamicLibs = parser.get<std::string>("d");
+  this->shouldPrintFileNames = parser.get<bool>("F");
 }
 
 BinaryFileCLI::~BinaryFileCLI() {}
@@ -28,9 +29,11 @@ void BinaryFileCLI::configure_parser() {
   parser.set_required<bool>(name, altName, description);
   parser.set_optional<std::string>("d", "dynamic", "",
                                    "input to the dynamic lib we want to load.");
+  parser.set_optional<bool>("F", "function", 0, "print out function names.");
 }
 
 void BinaryFileCLI::executeAction() {
   this->BaseCLI::executeAction();
-  BinaryDisassemble::action(this->filename, this->dynamicLibs);
+  BinaryDisassemble::action(this->filename, this->dynamicLibs,
+                            this->shouldPrintFileNames);
 }
\ No newline at end of file
diff --git a/src/cli/binaryfilecli.h b/src/cli/binaryfilecli.h
index 614f148..90e1abd 100644
--- a/src/cli/binaryfilecli.h
+++ b/src/cli/binaryfilecli.h
@@ -26,6 +26,7 @@ class BinaryFileCLI : public BaseCLI {
 private:
   std::string filename;
   std::string dynamicLibs;
+  bool shouldPrintFileNames;
 };
 
 #endif // __binary_file_cli_h__
\ No newline at end of file
diff --git a/src/runtime/binaryDisassemble.cpp b/src/runtime/binaryDisassemble.cpp
index 0e10ccd..4df3600 100644
--- a/src/runtime/binaryDisassemble.cpp
+++ b/src/runtime/binaryDisassemble.cpp
@@ -35,12 +35,16 @@ BinaryDisassemble::disassemble(const std::string &filename,
 
 bool BinaryDisassemble::action(const std::string &filename,
                                const std::string &dynamicLibPaths,
-                               std::ostream &out) {
+                               bool shouldPrintFileNames, std::ostream &out) {
   std::unique_ptr<Binary> binary = ASMParser::Parser(filename);
 
   auto disasm = disassemble(filename, dynamicLibPaths);
 
   out << *(binary.get()) << std::endl;
-  out << *(disasm.get()) << std::endl;
+  if (shouldPrintFileNames) {
+    out << binary->functionNames() << std::endl;
+  } else {
+    out << *(disasm.get()) << std::endl;
+  }
   return true;
 }
\ No newline at end of file
diff --git a/src/runtime/binaryDisassemble.h b/src/runtime/binaryDisassemble.h
index f84d22e..4979761 100644
--- a/src/runtime/binaryDisassemble.h
+++ b/src/runtime/binaryDisassemble.h
@@ -27,6 +27,7 @@ class BinaryDisassemble {
   disassemble(const std::string &filename, const std::string &dynamicLibPaths);
   static bool action(const std::string &filename,
                      const std::string &dynamicLibPaths,
+                     bool shouldPrintFileNames = false,
                      std::ostream &out = std::cout);
 };
 
diff --git a/src/runtime/internalData.h b/src/runtime/internalData.h
index c37b864..052b874 100644
--- a/src/runtime/internalData.h
+++ b/src/runtime/internalData.h
@@ -22,6 +22,7 @@ struct BinaryTypes {
 struct BinaryInternal {
   BinaryInternal() {}
   BinaryTypes binary;
+  std::vector<std::string> funcNames;
   void setElf(std::unique_ptr<LIEF::ELF::Binary> &elf) {
     binary.elf = std::move(elf);
   }
@@ -34,6 +35,26 @@ struct BinaryInternal {
   void setMachO(LIEF::MachO::Binary *machO) {
     binary.machO = std::unique_ptr<LIEF::MachO::Binary>(machO);
   }
+  LIEF::Binary::functions_t functions() {
+    if (binary.elf) {
+      return binary.elf->functions();
+    }
+    if (binary.pe) {
+      return binary.pe->functions();
+    }
+    if (binary.machO) {
+      return binary.machO->functions();
+    }
+  }
+  std::vector<std::string> &functionNames() {
+    auto funcs = functions();
+    if (funcNames.empty()) {
+      auto getFuncName = [](LIEF::Function &func) { return func.name(); };
+      std::transform(funcs.begin(), funcs.end(), std::back_inserter(funcNames),
+                     getFuncName);
+    }
+    return funcNames;
+  }
 };
 
 #endif //__internal_data_h__
\ No newline at end of file
diff --git a/src/runtime/runtime.cpp b/src/runtime/runtime.cpp
index 61a9eba..c9202f0 100644
--- a/src/runtime/runtime.cpp
+++ b/src/runtime/runtime.cpp
@@ -16,4 +16,8 @@ Binary::Binary(std::string path) : mPath(path) {
   mBinaryInternal = std::make_unique<BinaryInternal>();
 }
 
+std::vector<std::string> &Binary::functionNames() {
+  return mBinaryInternal->functionNames();
+}
+
 Binary::~Binary() {}
\ No newline at end of file
diff --git a/src/runtime/runtime.h b/src/runtime/runtime.h
index 4c84941..4677494 100644
--- a/src/runtime/runtime.h
+++ b/src/runtime/runtime.h
@@ -44,6 +44,7 @@ class Binary {
   OStype OS() const { return os; }
 
   const std::vector<uint8_t> &Instructions() const;
+  std::vector<std::string> &functionNames();
   friend class ASMParser;
 };